`
}).join('');
};
// --- CORE LOGIC ---
const handleCalculation = () => {
calculateBtnSpinner.classList.remove('hidden');
calculateBtnText.textContent = 'Calculating...';
calculateBtn.disabled = true;
setTimeout(() => {
const amount = parseFloat(document.getElementById('transaction-amount').value) || 0;
const results = cryptos.map(c => {
const totalFee = (amount * (c.percentFee / 100)) + c.networkFee;
const netAmount = amount - totalFee;
return { ...c, totalFee, netAmount };
}).sort((a,b) => a.totalFee - b.totalFee);
renderDashboard(results);
switchTab('dashboard');
downloadPdfBtn.disabled = false;
calculateBtnSpinner.classList.add('hidden');
calculateBtnText.textContent = 'Calculate Fees';
calculateBtn.disabled = false;
}, 500);
};
// --- UI & EVENT HANDLERS ---
const switchTab = (tabId) => {
currentTab = tabId;
Object.values(tabPanes).forEach(pane => pane.classList.add('hidden'));
tabPanes[tabId].classList.remove('hidden');
Object.values(tabButtons).forEach(btn => btn.classList.replace('tab-active', 'tab-inactive'));
tabButtons[tabId].classList.replace('tab-inactive', 'tab-active');
updateNavButtons();
};
const navigateTabs = (direction) => {
const currentIndex = tabs.indexOf(currentTab);
const newIndex = direction === 'next' ? currentIndex + 1 : currentIndex - 1;
if (newIndex >= 0 && newIndex < tabs.length) switchTab(tabs[newIndex]);
};
const updateNavButtons = () => {
const currentIndex = tabs.indexOf(currentTab);
prevBtn.disabled = currentIndex === 0;
nextBtn.disabled = currentIndex === tabs.length - 1;
prevBtn.classList.toggle('opacity-50', prevBtn.disabled);
nextBtn.classList.toggle('opacity-50', nextBtn.disabled);
};
const handlePdfDownload = () => {
const pdfRenderContainer = document.getElementById('pdf-render-content');
const amount = document.getElementById('transaction-amount').value;
const pdfContent = document.getElementById('results-container').innerHTML;
const header = `
Crypto Fee Comparison for $${amount}
`;
pdfRenderContainer.innerHTML = header + pdfContent + '';
// Remove "Best Rate" badge for PDF
pdfRenderContainer.querySelectorAll('span').forEach(el => el.remove());
html2canvas(pdfRenderContainer, { scale: 2 }).then(canvas => {
const imgData = canvas.toDataURL('image/png');
const { jsPDF } = window.jspdf;
const pdf = new jsPDF({ orientation: 'portrait', unit: 'pt', format: 'a4' });
const pdfWidth = pdf.internal.pageSize.getWidth(), margin = 40;
const contentWidth = pdfWidth - margin * 2;
const pdfHeight = (canvas.height * contentWidth) / canvas.width;
pdf.addImage(imgData, 'PNG', margin, margin, contentWidth, pdfHeight);
pdf.save('Crypto-Fee-Comparison.pdf');
});
};
// --- EVENT LISTENERS ---
window.switchTab = switchTab;
window.navigateTabs = navigateTabs;
calculateBtn.addEventListener('click', handleCalculation);
downloadPdfBtn.addEventListener('click', handlePdfDownload);
addCryptoBtn.addEventListener('click', () => { cryptos.push({ id: nextId++, name: 'New Crypto', percentFee: 0, networkFee: 0 }); renderConfigTable(); });
configTableBody.addEventListener('input', e => {
if (!e.target.classList.contains('cfg-input')) return;
const id = parseInt(e.target.closest('tr').dataset.id);
const prop = e.target.dataset.prop;
const item = cryptos.find(c => c.id === id);
if (item) item[prop] = e.target.type === 'number' ? parseFloat(e.target.value) : e.target.value;
});
configTableBody.addEventListener('click', e => {
if (!e.target.classList.contains('rm-btn')) return;
const id = parseInt(e.target.closest('tr').dataset.id);
cryptos = cryptos.filter(c => c.id !== id);
renderConfigTable();
});
// --- INITIALIZATION ---
renderConfigTable();
updateNavButtons();
switchTab('dashboard');
});
